Applications of Indocyanine Green (ICG) Enhanced Fluorescence in Laparoscopic Surgery

In the field of laparoscopic surgery, the use of indocyanine green (ICG) enhanced fluorescence has emerged as a significant advancement, enhancing the precision and safety of various surgical procedures. This blog post explores the applications of ICG in laparoscopic surgery, highlighting how this technology is revolutionizing minimally invasive procedures.

After injection, the ICG enters the lymph vessels. Under near-infrared light, the ICG emits green fluorescence, making it easier to visualize the lymph nodes. Image credit: from the paper "Mapping Lymph Node during Indocyanine Green Fluorescence-Imaging Guided Gastric Oncologic Surgery: Current Applications and Future Directions" published in Cancers.

What is Indocyanine Green (ICG)?

ICG is a water-soluble, tricarbocyanine dye that has been used in medical diagnostics for over half a century. When exposed to near-infrared (NIR) light, ICG emits fluorescence (light), making it an invaluable tool for visualizing vascular structures and tissue perfusion in real-time during surgery (1).

Here is a video explaining how ICG is used in laparoscopic surgeries and how it works:

https://www.youtube.com/watch?v=8_UYTRfz5-8

Disclaimer: I am employed by Olympus, a medtech company that manufactures equipment used in laparoscopic surgeries. The video featured in this blog post is produced by Olympus and is publicly available on YouTube and on the Olympus homepage. The views and opinions expressed in this blog are my own and do not necessarily reflect the official policy or position of Olympus.

ICG in Laparoscopic Surgery

The integration of ICG fluorescence imaging in laparoscopic surgery has significantly improved the visualization of anatomical structures, thereby enhancing surgical accuracy and patient outcomes.

1. Vascular Visualization: ICG is particularly useful in identifying vascular structures during laparoscopic procedures. When ICG is injected intravenously, it binds rapidly to plasma proteins and remains within the vascular system, allowing surgeons to visualize blood flow and vessel anatomy clearly. This application is crucial in surgeries where precise vascular control is essential, such as in liver resections or colorectal surgeries (2).

2. Biliary Tract Imaging: In cholecystectomy, the visualization of the biliary tree is vital to avoid bile duct injuries. ICG fluorescence cholangiography provides real-time imaging of the biliary tree, improving the identification of the cystic duct and common bile duct, thus reducing the risk of injury (3).

3. Lymphatic Mapping: ICG is used in sentinel lymph node mapping, particularly in cancers where lymphatic spread is a concern. The dye is injected near the tumor site, and its travel through lymphatic vessels is monitored, helping in the precise identification and removal of sentinel lymph nodes (4).

4. Assessment of Tissue Perfusion: ICG can assess tissue perfusion, which is critical in procedures like bowel resections. Adequate blood flow to anastomoses can be confirmed using ICG fluorescence, potentially reducing the risk of anastomotic leaks (5).
   

Advantages and Limitations

The use of ICG in laparoscopic surgery offers several advantages, including enhanced visualization of anatomical structures, reduced risk of complications, and improved surgical outcomes. However, limitations include the need for specialized equipment to detect NIR fluorescence and the potential for allergic reactions to ICG, although such reactions are rare.

Future Perspectives

The application of ICG-enhanced fluorescence in laparoscopic surgery is a rapidly growing field. Ongoing research and technological advancements are likely to expand its applications and improve its integration into various surgical procedures.

Summary

The use of ICG-enhanced fluorescence in laparoscopic surgery represents a significant technological advancement, offering surgeons an invaluable tool for improving surgical precision and patient safety. As this technology continues to evolve, its applications in minimally invasive surgery are expected to broaden, further revolutionizing surgical practices.

References and further reading

1. A review of indocyanine green fluorescent imaging in surgery. International Journal of Biomedical Imaging.

2. Real-time identification of liver cancers by using indocyanine green fluorescent imaging. Cancer.

3. Routine near infra-red indocyanine green fluorescent cholangiography versus intraoperative cholangiography during laparoscopic cholecystectomy: a case-matched comparison. Surgical Endoscopy.

4. Diagnostic Performance of Indocyanine Green-Guided Sentinel Lymph Node Biopsy in Breast Cancer: A Meta-Analysis. PLOS ONE.

5. Intraoperative laser fluorescence angiography in colorectal surgery: a noninvasive analysis to reduce the rate of anastomotic leakage. Langenbeck's Archives of Surgery.